It would be useful to be able to use the variable old_html in AbuseFilter on Wikimedia wikis (specifically, it.wikiquote): old_html is currently calculated (see e.g. [[Special:AbuseFilter/examine/log/1864098]]), but if you try to use it in a filter you get the error: «Syntax error detected: Unrecognised variable old_html».
I suppose this is a wanted behaviour to reduce resources consumption, but I file this bug as a placeholder/reminder.
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- bz22075
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Looking at AbuseFilter.class.php, those two variables are commented out with the note "Disabled, performance".
We could add a new preference option ($wgAbuseFilterOldVariables) which could be used to then enable them on a per-wiki basis?
I'll look to see if I can find any discussion on why they were disabled.
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It would require parsing the old text, which would be slow, therefore it is going to severely impact efficiency of filters. Harms outweigh benefits.
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It would require parsing the old text, which would be slow
The HTML of the "old" text is in fact the current HTML when the filters are run, isn't it?
Slowness can be excessive in general but there are cases where this should be possible to configure. For instance, isn't RESTBase supposed to provide cached HTML for revisions on Wikimedia wikis? If the solution were to be very special-based I can understand it would be very low priority.